By nature , children this age can be more concerned about their own needs and even act selfishly. Often they refuse to share anything that interest them, and they do not easily interact with other children, even when playing side by side, unless it’s to let a playmate know that they would like a toy or object for themselves. This is a normal behavior for most two’s.
Some of our children in class are beginning to interact with their peers. You will see some of them engaging in pretend play. Pretend play builds language , thinking, many social skills when children take on roles and develop their own ideas and stories. Two year olds are also capable of empathy, understanding the feelings of others. 
Pasadena Christian Preschool 